In the 1970s, while the rest of the world was waiting for “the next ice age” predicted by scientists in the 1960s, NASA Scientist James Hansen and three of his colleagues were investigating the impact that humans might have on climate change, specifically global warming. During his study Hansen concluded that the world needed to brace itself for a cycle of global warming brought on by man-made pollution.

James Hansen is an award winning scientist and author with B.A degrees in physics, mathematics and astronomy. Hanse, who leads the Goddard Institute for Space Studies, has taught at The University of Iowa, and Columbia in New York. He is heavily involved in earth science studies and he is interested in climatology as a sideline.

» How much "Man Made" CO2 Is In The Earth's Atmosphere?
I think ALL of the CO2 in the Earth's Atmosphere is from man.
I'm not sure how much "Man Made" CO2 is in the Earth's Atmosphere.
There is .04% CO2 in the Earth's Atmosphere and of that "Man" has added an extra 4% (1 part in 62,500)